Method for eliminating low carbon steel cover annealing yield point elongation

A bell-type annealing and yielding platform technology, applied in bell-type furnaces, process efficiency improvement, elongation control and other directions, can solve problems such as affecting the quality qualification rate of cold rolling mills, easily generating slip lines, and increasing production costs. , to ensure the performance, avoid slippage, and save costs

Inactive Publication Date: 2012-07-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the low-carbon steel cold-rolled strip yields, it needs to be re-leveled, which increases the production cost by 80 yuan per ton, and directly affects the quality pass rate of the cold-rolled mill. Slip lines are easily generated during the strip rolling process, which greatly affects the user's use

Method used

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  • Method for eliminating low carbon steel cover annealing yield point elongation
  • Method for eliminating low carbon steel cover annealing yield point elongation

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Steel type Low carbon steel, grade St13. Strip thickness 0.5mm, width 900mm. The bell furnace annealing process is adopted, and the total weight of the coils loaded in each furnace is 85t.

[0016] After the winding furnace is installed, the temperature in the furnace is naturally raised to 400°C;

[0017] Raise the temperature at a constant speed for 4 hours, and raise the temperature in the furnace from 400°C to 550°C;

[0018] Raise the temperature at a constant speed for 4 hours, and raise the temperature in the furnace from 550°C to 650°C;

[0019] Raise the temperature at a constant speed for 2 hours, and raise the temperature in the furnace from 650°C to 710°C;

[0020] Insulate at 710°C for 4h;

[0021] Cool down for 2 hours at a constant speed, and reduce the temperature in the furnace from 710°C to 680°C at a constant speed;

[0022] After cooling at 680°C for 7 hours, remove the heating cover and put on the cooling cover;

[0023] Air cooling until the ...

Embodiment 2

[0027] Steel type Low carbon steel, grade DC03. Strip thickness 1.5mm, width 1350mm. The bell furnace annealing process is adopted, and the total weight of the coils loaded in each furnace is 100t.

[0028] After the winding furnace is installed, the temperature in the furnace is naturally raised to 400°C;

[0029] Raise the temperature at a constant speed for 4 hours, and raise the temperature in the furnace from 400°C to 550°C;

[0030] Raise the temperature at a constant speed for 4 hours, and raise the temperature in the furnace from 550°C to 650°C;

[0031] Raise the temperature at a constant speed for 2 hours, and raise the temperature in the furnace from 650°C to 710°C;

[0032] Insulate at 710°C for 5h;

[0033] Cool down for 3 hours at a constant speed, and reduce the temperature in the furnace from 710°C to 680°C at a constant speed;

[0034] After cooling at 680°C for 7 hours, remove the heating cover and put on the cooling cover;

[0035] Air cooling until th...

Embodiment 3

[0039] Steel type low carbon steel, grade SPCD. Strip thickness 3.0mm, width 1550mm. The bell furnace annealing process is adopted, and the total weight of each furnace is 130t.

[0040] After the coiling furnace is installed, the temperature in the furnace is rapidly raised to 400°C;

[0041] Raise the temperature at a constant speed for 4 hours, and raise the temperature in the furnace from 400°C to 550°C;

[0042] Raise the temperature at a constant speed for 5 hours, and raise the temperature in the furnace from 550°C to 650°C;

[0043] Raise the temperature at a constant speed for 2 hours, and raise the temperature in the furnace from 650°C to 710°C;

[0044] Insulate at 710°C for 5h;

[0045] Cool down at a constant speed for 3 hours, reducing the temperature in the furnace from 710°C to 680°C;

[0046] After cooling at 680°C for 7 hours, remove the heating cover and put on the cooling cover;

[0047] Air cooling until the temperature in the furnace drops to 400°C,...

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Abstract

The invention provides a method for eliminating low carbon steel cover annealing yield point elongation. In the method, rational cover annealing process system and leveling elongation are specified and adopted, namely the wider the strip steel width, the larger the overall weight of strip coil filled in a furnace each time and the longer the annealing time; and the thicker the strip steel thickness, the higher the leveling elongation of the strip steel. Thus, the formation of the yield point elongation of steel is effectively controlled; the yield point elongation phenomenon occurring in low carbon steel cover annealing is eliminated; the quality qualification rate of the low carbon steel cold-rolled strip steel after cover annealing is increased from 90.04 percent to 97.95 percent; the amount of repeatedly leveled strip steel is greatly reduced; and the cost can be saved by 80 Yuan per ton. Meanwhile, the strip steel loss in a repeated leveling process is reduced; the yield of the strip steel is increased; the problem of slippage of the strip steel produced in a machining process of a user is avoided; and the service performance of the strip steel is guaranteed.

Description

technical field [0001] The invention belongs to the field of cold rolling and annealing technology, and particularly relates to a method for eliminating the yield platform of low carbon steel after annealing in a bell furnace. Background technique [0002] When cold-rolling mills produce low-carbon steel cold-rolled strips, obvious lower yielding, that is, yield plateau phenomena, often appear in the tensile test of the finished strips. The reason is mainly due to the interaction of nitrogen atoms, carbon atoms, solute atoms and dislocations in the steel after the low-carbon steel cold-rolled strip is annealed in a bell furnace, forming a solute air mass, or offset air mass, offset air mass It can hinder the movement of dislocations, because through the elastic interaction between solute atoms and dislocations, the static pressure field of dislocations can be relaxed to reduce the elastic distortion energy of the system, so that solute atoms segregate near the dislocations. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D9/663B21B37/56
CPCY02P10/20
Inventor 许新庾丽付薇王姝魏国清
Owner ANGANG STEEL CO LTD
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